Cash-back rewards cards can be a powerful tool for your wallet. Used correctly, the best cards reward cardholders with the equivalent of a 2% discount on every purchase. Some cards offer beefier cash-back bonuses in special categories like gas and restaurants, where spending can earn at a rate of 5% or more.
Over time, rewards can really add up. But there are three things you should know before you apply for a cash-back credit card.